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Finding the Fourth Proportional to 61,858.85, 85,321.16 and 56,770.79

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Solution

The fourth proportional to 61,858.85, 85,321.16 and 56,770.79 is: 78,303.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,858.85 : 85,321.16 = 56,770.79 : x
  2. Step 2: Convert to fraction form
    61,858.85/85,321.16 = 56,770.79/x
  3. Step 3: Cross multiply
    61,858.85x = 85,321.16 × 56,770.79
  4. Step 4: Simplify right side
    61,858.85x = 4,843,749,159.35
  5. Step 5: Solve for x
    x = 4,843,749,159.35/61,858.85
  6. Step 6: Final answer
    x = 78,303.26

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.